Q. Mirror formula is valid for

दर्पण सूत्र किसके लिए मान्य है?

Plane mirrors only
केवल समतल दर्पण

Spherical mirrors only
केवल गोलाकार दर्पण

All mirrors
सभी दर्पण

Convex lenses
उत्तल लेंस

The mirror formula $\frac{1}{f} = \frac{1}{v} + \frac{1}{u}$ applies to spherical mirrors (concave and convex), not plane mirrors or lenses.

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